For long flame and easy ignition, the coal used should have_________________?
A. High volatile matter
B. Low ash
C. High calorific value
D. High ash
Fuels and Combustion
Coke oven gas is stripped of its H2S and mercaptans content by_________________?
Coke oven gas is stripped of its H2S and mercaptans content by_________________?
A. Absorption in wash oil
B. Adsorption on bog iron bed
C. Bubbling it through dilute sulphuric acid
D. Adsorption on silica gel
Presence of nitrogen in combustion air does not reduce the ____________________?
Presence of nitrogen in combustion air does not reduce the ____________________?
A. Amount of heat liberated
B. Flame temperature
C. Flue gas temperature
D. Any of the above
Coke oven gas constitutes mainly of ____________________?
Coke oven gas constitutes mainly of ____________________?
A. H2 & CO
B. H2 & CH4
C. CH4 & CO
D. H2 & CO2
Natural draft created by the chimney depends upon _____________________?
Natural draft created by the chimney depends upon _____________________?
A. Temperature of the flue gas
B. Its height
C. Both A. & B.
D. Neither A. nor B.
Coke oven gas produced by high temperature carbonisation of coal (as compared to that produced by low temperature carbonisation), has_________________?
Coke oven gas produced by high temperature carbonisation of coal (as compared to that produced by low temperature carbonisation), has_________________?
A. Higher calorific value
B. Lower hydrogen content
C. Both A. and B.
D. Neither A. nor B.
Purity of coke means that, it is high in carbon and low in __________________?
Purity of coke means that, it is high in carbon and low in __________________?
A. Volatiles
B. Ash
C. Iron
D. Moisture
Which of the following is not a ‘manufactured’ fuel ?
Which of the following is not a ‘manufactured’ fuel ?
A. LPG
B. Coal briquettes
C. Tar
D. Colloidal fuels
Which of the following has the highest gross calorific value ?
Which of the following has the highest gross calorific value ?
A. Blast furnace gas
B. Coke oven gas
C. Carburetted water gas
D. Oil refinery gas
With increase in moisture content of coal, its_____________________?
With increase in moisture content of coal, its_____________________?
A. Calorific value increases sometimes
B. Bulk density always decreases
C. Clinkering tendency during combustion increases
D. None of these